fritz3000g wrote:I just spoke with a Yanmar mechanic locally who was very friendly. His perspective is that sailboats in our area generally get less than 40 hours of engine runtime per year. I'd assume this would be different in a warmer climate. He said that a 1980 engine that had spent its life in our area probably has 1500 hours on it. While it may need a tune-up, it most likely has significant life left unless someone failed to replace an impeller or something major.
Interesting. Not what I expected to hear.
I guess I have a different take on things than your mechanic. In my experience with things boat-related, they are going to break from use, or they are going to break from lack of use. When an engine starts getting really old and you have to do some bit of maintenance like replacing a fresh water pump, one critical bolt shearing off during the process because it hasn't been removed in 40 years can effectively total the engine if you can't find a way to drill it out and re-tap it without piercing some critical part of the engine. But this is true with any vintage boat, not just Cape Dories.
I once had a boat with a BMW Marine diesel. (BMW went out of the marine business in 1987.) We chose to replace the engine in 1999 after only 12 years of operation, not because there was anything fundamentally wrong with the engine itself, but because the bolt-on "marinized" components (for example the cooling system) were failing and replacement parts were either unavailable or hideously expensive. If I recall correctly, when our oil cooler/fresh water heat exchanger failed from electrolysis, BMW wanted $2,500 for a replacement oil cooler that would have had the same problem of 3 different metals bathed in electrolyte and which would have caused the same problem again in the future. That $2,500 in 1999 is about $4,200 in 2021 dollars. For the cost of a few bolt-on components we could buy a new Yanmar engine, and that is exactly what we did. Although Volvo is still in the marine business (unlike BMW), you may still have trouble locating parts for these old engines.
My point is, if you are thinking of purchasing any boat in its 4th decade of service that has an original engine, you should keep in the back of your mind that a re-power may be necessary at some point in the not-so-distant future unless you are a good mechanic with a knack for finding creative solutions to tricky mechanical problems.
By no means am I trying to dissuade you; I'm just suggesting that you manage your expectations, and perhaps factor a repower into your boat purchase budget at some point in the next few years.
Smooth sailing,
Jim